Example 2 A project area is (16 km) long in the cast-west direction and (10.5 km) wide in the north-south direction (see Fig. 14-5). It is to be covered with vertical acrial photography having a flying height 1830 m. End lap and side lap are to be 60 and 30 percent, respectively. A (152.4-mm- ) focal-length camera with a (23 *23 cm) square format is to be used. Prepare the flight map on a hase map whose scale is 1:24,000, and compute the total number of photographs necessary for the project. 1690 (

Example 2 A project area is (16 km) long in the cast-west direction and (10.5 km) wide in the north-south direction (see Fig. 14-5). It is to be covered with vertical acrial photography having a flying height 1830 m. End lap and side lap are to be 60 and 30 percent, respectively. A (152.4-mm- ) focal-length camera with a (23 *23 cm) square format is to be used. Prepare the flight map on a hase map whose scale is 1:24,000, and compute the total number of photographs necessary for the project. 1690 (

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter14: Highway Surveys And Location

Section: Chapter Questions

Problem 10P

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Images a, b, and c of ground points A, B, and C appear on a vertical photograph taken from a flying height of 2625 m above datum. A 153.16-mm-focal-length camera was used. Points A, B, and C have elevations of 407 m, 311 m, and 379 m above datum, respectively. Measured photo coordinates of the images are xa = –60.2 mm, ya = 47.3 mm, xb = 52.4 mm, yb = 80.8 mm, xc = 94.1 mm, and yc = – 79.7 mm. Calculate the horizontal lengths of lines AB, BC, and AC and the area within triangle ABC in hectares.
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The vertical photograph was exposed with a 60 cm focal length camera at a flying height of 3,000 meters above datum. What is the photo scale at point a if the elevation of point A on the ground is 300 m above datum?
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Determine the horizontal distance between two points A and B whose elevations above datum are hA = 1840 ft and hB = 1425 ft and whose images a and b on a vertical photograph have photo coordinates xa = 2.95 in., ya = 2.32 in., xb = -1.64 in., and yb = -2.66 in. The camera focal length was 152.4 mm and the flying height above datum 7900 ft . Express your answer in feet to four significant figures.